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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a04c3ff132c8cc7853b07565331bd9ccd04d4009a74398665a29d1dc62ce4bc' 
  AND token = 'QsISgJnnFiXdhMeBvhFuPumsbekGPwrL/1y4sod1UUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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