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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e2fbdc283a25c6a0c532f5e2ad5ddfebf2103719211e50ffe0ad62398a833f' 
  AND token = 'zs2Wa/AZ6pxqZESomg3s9jwjdqHUhHLPNyl2TQyQ1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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