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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c31eb0bdd46fe7e3caa9e98110484c6b7156ba5bc21c49160c22dcdb1dba722' 
  AND token = 'jK+C0CogGUtjUqo40/qnfWTRpKJbVxAT9MNYxhtdZh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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