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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e319682e91cde44ddc626c7f0f5e03eeebdba97b55a574a123eee264ffd329' 
  AND token = 'Z0BXUiRgP7tkE2J6+6aGrlIVWUqnruhpVaTgx/ba5D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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