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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a18f40c971ced756708c474f64425de65ff6192a4135e32013d9214d805013' 
  AND token = 'DMG6Y/HeX3KH6Sh4VAWJG1o8zv9Z601QG3RzNt6ELYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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