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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6eae4c41f8b88d183ab9a5456db70eac6fe245ed718a1cca1f611003eb146d6' 
  AND token = 'y0oXewuIKqG/p0KBebYBeSyP07D39L69fjKQz/7yJMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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