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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f09cf9996523ac5f79ab902f430dab9b9593326beeaabbccfc536b97b207d5' 
  AND token = 'J+8k3m3vcZ5eEJY4tGoIFIen/CzuEOLD9T01l/V3DDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}