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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40825c9dd41c0d2a292fd3c3b18c7183f4fc7991e6c65a10efa0de201d1d8be9' 
  AND token = '9Vh3m61fESv9yOpcEiBoeFpX4umrHwLdDJKFpqA44Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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