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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc83b7c5286696bc670c0942e323ae3a9dfe36ab97073443e7d7634430e7778d' 
  AND token = 'YG+drvZn4wVT7fopWMOBRUfRIMHaVGOJxDl7K14fkiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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