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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a3c43ba45692e5e61f282823e90eb45318c65ca7851d5a7a7010c17cdc0115' 
  AND token = 'hYtGsg5Rf5CrBnmwoyejmDuSBN4up91ZHKSaDz5+rK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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