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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f979c975fa71f7f93aacbd8044600acaf78653ab13376e597fc6cc223c6a5c' 
  AND token = '4Pz1OY7wG3Z9vfbXQugIB9M1yXIBDQYBFNUp30BJ6Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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