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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aadf962a28adcb7bb149163632b4e2b2a10d3e262eeff81b0f74c49d91a68b' 
  AND token = 'PXGnIP6+aZEw0C9w2Kj8ek9ZDf3BqE4gmn+epADjlXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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