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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712a8ade114367bf4f30e97d23eaf0385fb04233794f87c6209f76a2e633809d' 
  AND token = 'cCxtMsCeCRdOh9PH/oNIV2d/ROz4ljph6972WgoZA0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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