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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d43757f8ab9b298e10796a54f7c836eeb644e907d57e9c900965ce2ba4887b' 
  AND token = '38yrwlU9Uu7J7NOfRBepnlsAN1gtS/vG5SYWFZzPbl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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