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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd848d18042660b960081029bdc1b00832e056e4b3d539aa108476e0932814c33' 
  AND token = '0ST29LtK9PvZ1KuhQIHVN37StaXeT+Lp4fyDUQuJjoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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