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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b8bb10f8ec084fc9a2e3dff91b116ad7c69921f9a9da5e8f4f31ef64f7e12d' 
  AND token = 'NQM6EyotC/CGBnlCqOI9DC4pEIux+PxmLhrrbXarMLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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