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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c832e5f7ba32eda33beaf669678c8476759586ce0487933f69f65477361508' 
  AND token = 'z1QdUGf+Mb6LRlOwAJXX/oGQM5Z1HOhw7J0AnMTbOr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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