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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f3f353095da0a84b3c9e888eca6d8d39d86aa592b551d106a06bfc29eee63a' 
  AND token = 'e/9jdEF3AhZd6n4R/H1mYCKurCO/scFlGlTaOkFK6P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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