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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abca0dc17621cf7d6e3e97a22f230eab97606ac4e298053c12607089a9aaffa' 
  AND token = '9fVewt2D3tTyqQ60A9snZRamS/1ojIz3DPCYcEv7hYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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