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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a557d64301a64b05ce4cfa743fbc37aafae81eebb8a88d2d8bedbe810c669703' 
  AND token = 'KC6koZ7LbiMWPyM9vJ1uWqmmUATZD/Jy9xSJq6fbu1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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