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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1e594f62017b15fd390603f13303b03301c3d993615d415b42e7b77caf8279' 
  AND token = 'IN0bc2N9AU7uvmOwyCvujArZviBsni1m22qxwSmCZeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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