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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2699f877e100c48ab206300d43bd5ef42f11380c13a2d5ade01401073bfb6c4c' 
  AND token = 'kS+1xfrwobMIqe9TYu7OmwIMc2q8z+/Epi6T4ZicCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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