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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300471ec0523a46c48555738ad48a879c0cd417339e58319a6007f64dbb369a0' 
  AND token = 'HZEPmbJy6KerfcUxgl1tbjvNFEZyo/ChvajYsnkf3Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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