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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab703fcfdb4eb3dfc94948a88bbb180ece442daa59c79cb521178d81986dce2d' 
  AND token = 'XkfvZ02sBjv9kJc1o3N06b+0VJKaOrPDOzmZKr5dM78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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