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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b284c85e62b688bdaa995d374650b638fb35defe0793ed1d30c20d7a9cb56' 
  AND token = 'W1SIOgsNV5eNfDRryKtBF+0193cy4NZYt7cXrHC1pEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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