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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239844c853c7586c5ca7f1c74bbc80f2499ff153d427c36ea1c831010c14784b' 
  AND token = 'N6xIK8H6bcp2Yplg598WcFCnEzMhtwoO/Rf3M1OUjsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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