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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a30a14f45804b1c4ca338e9ab96dfc1709596e59078ffb79ca5c5418b670dd3' 
  AND token = 'uwka6Rhh1z1QFtp5WrVvkJR2NxJvSWPcJOLXHYkNO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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