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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1537fb245143432668a9e49b229e525f90200f5263762f63779120f7741643' 
  AND token = 'ZbxFDkyjuPxLk8scQJXwc5+G//L8S+R1N36GULgJA9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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