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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb090161f8420b8f95bc9e890c9e6f658df0ce3da60004201778f7bb5ea8134' 
  AND token = 'IHRi7VDCfLiGnxNlAk4E3PULl3s04Wrh3tPwOP4WzKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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