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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9c25a7a8243ee6643ca0517af4afba77a340e0ba4fd42918dd7e66a87671db' 
  AND token = 'h4jv/nAAUEAbzWZjPsySgMD+OHak+SKyhlB94YinHZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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