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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977798c1c0de4681658e9779140e393a04b0903660722bc5f5852f086dd1ced3' 
  AND token = 'GBzL7ZlL2PEiAP44CXcw1Y5aY8C+tdQEKHJm1RzRsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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