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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ba1dd9e2b09090264e9aba706e64be08eb8a6e375f573f939965c2ef98782f' 
  AND token = '69kINQVzpr8SNOzOO1piuMEFxlIyR/PwK/o/j8Jg8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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