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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1ad0506b6f66b105b67db0d391f59965321833b42b30acbbb108d9c652795c' 
  AND token = 'RhWM1L9MC6JdWR6QE5KKS6/x7B+o/ImsBsgYxTSyPN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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