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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ee3ebcbc44aee012f8f4c7971cfac0df9f503ffe40c4cd567afc9a621f0920' 
  AND token = 'fbeK5IkflkYZXPdS9Rh0fGtMgdDxS0AxHte0KeaL/U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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