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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9d8c417b9ec0f43f5b3f82c3a0470dd6cfb82ce9ccee549c9e7f7f347a6ebc' 
  AND token = '60D0iM6GPqEr3ffAz5UbMSkXKsTUEHs0yCSzWPaG3IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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