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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5716bcbdc41c76a46d85c412d95f9c2f94632c8e01c582945289dd01689af839' 
  AND token = '47GBEarEeaNfWzGsDmHsIG5E7kMCojIgiVdZNXZH5wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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