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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767f68abc611575dbaa70ec3f8d6671917abd17879a0a20408980cd5de5fca2b' 
  AND token = 'j8OUc+e7GRkfhtpoRdRnstrJUUSjjOFm6iqXHknjobg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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