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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcc6ae3b5e824e6c28457dae579f0055951710a9c853cdf3bb5fe5dea3b54ab' 
  AND token = 'AG834ow4kzjI68HvQdSZbnWNQDu98L+ExCDLrX2K+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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