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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb0fdfe477ff2ec963c7e090277ff2217d0e1d15f8662222f2faec2474891fa' 
  AND token = 'ldRZcWyeT4cwJQnJyMER3OSqgU3AE/7TmlSs5Dt6B7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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