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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8225fea48b64afb8816cfbbb29a8c26a67af05f95aa2bb7919fc8dbbede6cb' 
  AND token = 'mDnG01rF2s7DzovsszU8vUr39ubA9ijjm4MOZ2EVlcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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