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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6ba99e27d08da51c4e2a7079e138f72d24db005916733f2aa7b643b8dda7ac' 
  AND token = 'aSjtsd3h6pHZuT57Yp4stfNOF592dBuGpYR0UdxRYto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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