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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b51040870fb7274654350503781a419f0e58a1f4e4849dec1f8420a6dac8e5' 
  AND token = '/pkvK6TsGj9Qn3jFjCVVlu9ONu0mi0KSTyIifKZ5M8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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