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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89e90320997c6dac0045f0208a8a1d375aa7580562e1c7de79b7ccb47f93771' 
  AND token = 'df2nzuI3hI//uoyFJ5FM6cL5Z1ig8fQSH98kcaBGhHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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