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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7aa627a553225cbb170bf46377f3f7ce61ec52acf70a8ac9ecdbaafdc4ba0a' 
  AND token = 'bZhE0CGw2mJc/2wA9KhHFCIf/eHGOjRQF5QcYSV1VZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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