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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22562c131e57a179583f7de1ff4c73493c44cde771c3d7c4f0f461ee59d5a487' 
  AND token = '1K7jtXYYLd97x0y8uhd2DNJ5KJkTXkI28yUKS0GBIoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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