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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e7927b692b239184726fa403b8c5a7e76baf6356a5747588ce471692e1df90' 
  AND token = 'YpFMm62gwTCZikNfOTezlgPUJKyIg3Ue3GYc9z6YWEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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