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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81a318b9e0135eb27b82e94c17ebcf6e3cca7e9b1a1f47496884d1eb5836137' 
  AND token = 'DmR3YeApD82cHEOt6VxJf/I8Vt+8LLYVA0YRtXV0u8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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