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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd294a98298fa05d87d746fe12b720805474eaf05d03e6d93f88a88d55ea735fc' 
  AND token = 'NCDOsK+iRZnq6Y7cyzlkWy4cXWr2JRkiTD6EUXg7Evw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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