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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fc13e985788bae62d6f6ee7b81381f9c40d138c6b3b62b5af745669978d90f' 
  AND token = 'qYcNYYQhgik19I85DTb6Z36VB+7cXeAi3tYKPaasy4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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