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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ff4f4cd5464026617f94183851941a8ed411e2ed4322216cd73666ac4250b0' 
  AND token = 'dvAaS7aWCIRzb0xwR1kA9gpjcQuE3c059YyItUF2S40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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