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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be66c260b7a7d66f2c696ec0e77dc9cc3fa4dd952b8f18c6a9b5b221f09ef7e' 
  AND token = 'qwiQw+b9Jcz0ebpesXLQV+xm/q40UHL6V9VcIl3AJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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