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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62030feff19aeff215c45aa5266951480eea0fc52bffccce45310634678bb443' 
  AND token = 'MiOw+5ut4OoofxZ67wKhQL9FiA0megM9vdI9mMy9v08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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