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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30b5187a5a7ee197b3cb355a5c56603cbf228b1812ca5340df707c83064d0ed' 
  AND token = '6lsNnAPdqH082mgbEx7nJnhN2UnQsgvyyCk0YBBbEa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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