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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddd29b22c86346747ddcb36388c2cfd441b58059256901a421356fb26ae5c88' 
  AND token = 'dwXY0117cAZEBzJmJB1kR169PSEg8cYF4AG4cTdMnmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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