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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49e7e290e61d9aec7fbaf899ec6ef337641b8c0d4fffe98b86ccfa8bd3bfc24' 
  AND token = 'Zg14zgts1BZJujU6OJAVBSTE0Fm/Epus90x4MFi3QFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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