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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7a8acadbb49ee7292d1a38340e4fe38f2156b8030d837076fa00c47ea90fd5' 
  AND token = 'p9idBseWKCfdqHuqUJveKtGyNn0nMGb+MH2JuzvutA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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