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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6048ce02ae35e4aaf766141c3df3fd66916058532708bdd1fd65a3a259e9b2c' 
  AND token = 'dM+vjOs2ZiOQIzj65AACrFgpxxww8e25j39qDla0IWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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