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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76f9a35028b5762a0e69b377c8ff24cb032d176830ee0ef38eaffdd48b700ba' 
  AND token = 'sJIXLUXCTPkRDUuEeIZ0Qa/xWuv8GES3ZkO/LMTR+vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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