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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f96f3fbb8ff854c9fddb5c0e29dfba7dad45fce627954f894e968c31a2879c' 
  AND token = 'J4F1ke1g9k5lJKsgK5VvwdsXE1Y5wLQfNnR6g4cqTcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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