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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd750c5f50a6713f42c90d36695664f637f8872087e828f75ee4746cdb35db1e7' 
  AND token = 'd3H7NYQzkitP0rS7Q5JvC42YPTdMejdIN/nqoppHPFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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