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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df32499374a6706c4513c5329b7b4f35fb39c5823a7331ca1207512ed0a19eb1' 
  AND token = '07h7DMcg5K3Enlj4bjp9NEOFyoiJTCGxBYAAMd4xihg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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