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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb350447fc51e193fe9dcd815fc5e95cffc995547e4cc7ff9b5eaa9f3db91eb' 
  AND token = 'vj/tUjRpSEV/M5SICWT7K8b/uXQJiS3gsKIcXOKP+pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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